The version of VirtualDJ LE supporting Tiger 10.4.11 is VirtualDJ 5 LE coming with DJControl MP3 E2.If you have a DJControl MP3 e2, the VirtualDJ serial number is written on a label on the ground side o﻿﻿f the controller(the serial number is like that XXXX-XXXX-XXXXX/E2), so, with this number, you must- create an account on VirtualDJ websitehttp://www.virtualdj.com/users/create.html- once you have created your account, click on "My Licenses" button, and type the serial number in the field "If your controller came with a VirtualDJ OEM license number, or if you have a license number from an older version, you can enter it here"- then, after you have clicked on OK, you see the icon of the DJControl Mp3 e2 in the list, with the VirtualDJ 5 LE (DJControlMP3 e2) title, and you can download the Tiger version(the installer is VirtualDJ DJC e2 1.0.2)